Do we need to purchase hot wheels cars specifically? or does this work with "off brand" (matchbox) cars?

Yes you do. You have to get the hot wheels that says 1.64 weight for it to work. I bought the regular to see if they worked and they didn't they were to heavy of you scroll to the bottom of the page on here it will say add additional cars or tracks. And you can purchase some

My home is pretty small; would it be easy to take down and build again with each grandchild visit?

Absolutely. My boys put it a part and back every 15 min as they add additional parts.

do i need to purchase the straight tracks as well? or thats just additional?

All the track pieces you see in the pictures come within the toy package. If you are wanting to add additional track pieces to this you would need to purchase those separately. I hope this answers your question for you. Let me know if you have any further. Thanks.

how big is the footprint of this when it's built?

Hot Wheels Criss Cross Crash Track SetThe Hot Wheels Criss Cross Crash track set has four intersecting crash zones and a car feeder ramp for amped up action. Kids can line up their Hot Wheels cars and let 'em rip for near misses or total wipeouts. With more than 16 feet of track that includes hairpin turns, motorized boosters and a giant crash zone, kids can enjoy crash-and-bash fun for hours on end. Includes parking spaces throughout the set for additional storage and safe guards for kids over the crash zones. Comes with one Hot Wheels vehicle. Not for use with some Hot Wheels vehicles.DLegal Disclaimer: Features:- This sturdy elevated figure-eight track with four intersecting crash zones delivers amped up crashing action!- With more than 16 feet of track that includes hairpin turns, motorized boosters and a giant crash zone, kids can enjoy crash-and-bash fun for hours on end- Includes parking spaces throughout the set for additional storage and safe guards for kids over the crash zones. Comes with one Hot Wheels vehicle- Great gift for any Hot Wheels fan- Great gift for any Hot Wheels fan- Product Weight: 4.45 Product Dimensions(in inches): 23.900 X 14.600 X 2.900 Dimensions are provided for general reference only and are neither meant to indicate the dimensions of the package used for shipping nor the product's specific dimensions. Typically, the dimensions represent the dimension's of the manufacturer's packaging. "Compare At" Pricing: The "compare at" price that is struck through above represents the original price of the product as sold by Toys "R" Us. This price may or may not represent the price the product is currently being offered for sale or has been offered for sale within any particular period of time by the seller or another online retailer.

Number of Pieces	1
Item Weight	2070 Grams
Item Dimensions	29.13 x 29.13 x 7.87 inches
Pattern	Track Set
Style Name	Crash Set
Item Shape	plane
Collection Name	Tracksets & Playsets
Color	Blue
Theme	Hot Wheels track sets
Material Type	Plastic
Required Assembly	Yes
CPSIA Cautionary Statement	No Warning Applicable
Assembly Time	0.25 Hours
Not for Kids	No
Number of Batteries	4 D batteries required.
Includes Rechargeable Battery	No
Number of Players	1
Special Features	Portable
Includes Remote?	No
Skill Level	Beginner
Is Electric	No
Power Source	Battery Powered
Scale	1:64
Battery Type	Alkaline
Educational Objective	Cognitive Skill, Imagination Development

Hot Wheels

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